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Home >> Ford >> 2000 >> Contour SE, 2.0 3, Standard >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Engine Controls - System & Engine Component Tests - EEC-V (Bi-Fuel & Natural Gas)) >> Fuel System (Natural Gas Vehicles) >> Unable To Vent Fuel Tanks Or Fuel Lines (ECONOLINE) >> Pre-Inspection

Unable To Vent Fuel Tanks Or Fuel Lines (ECONOLINE): Pre-Inspection

WARNING: This page is about a different variant/trim than selected.

Visually inspect fuel system for damaged fuel tanks, solenoids, fuel lines/hoses, fuses, relays and loose or corroded connectors. If any faults are indicated, repair as necessary. If no faults are indicated and system will not vent, go to step  1.

    NOTE: Battery must be fully charged to perform solenoid diagnostics. Whenever connecting vent tool, ensure vent tool bleed valve is closed.

  1. Check Mid-Ship Fuel Tank Solenoid Valve For An Open
    Turn ignition switch to OFF position. Insert grounding spike into earth. Connect Grounding Cable (134-00121 ) between grounding spike and backside of fuel fill valve at fuel line connection. See Fig 1. Connect Fuel Filler Neck Venting Kit (134-00116 ) to fuel fill valve. See Fig 2. Connect Venting Hose (134-00118 ) to vent stack that allows natural gas to be vented outside of repair shop. Vent stack installation must be approved by local authorities. Close and tighten manual lockdown jack screw on No. 2 and 3 fuel tank solenoid valves (if equipped). Tighten jack screws 62-80 INCH lbs. (7-9 N.m). Open manual backflow valve on backside of fuel filler valve. See Fig 1. Open bleed valve on fuel filler neck venting kit for 60 seconds. Close bleed valve. Observe system pressure on fuel filler neck venting kit pressure gauge. If pressure is zero psi (zero kg/cm2 ), go to step  3. If pressure is not zero psi (zero kg/cm2 ), go to next step.

  2. Check Mid-Ship Fuel Tank Solenoid Valve Pink/Black Wire For Short To Power

    Disconnect mid-ship fuel tank solenoid valve 2-pin connector. Measure voltage between chassis ground and Pink/Black wire at mid-ship fuel tank solenoid valve wiring harness connector. If voltage is 10 volts or more, repair short to power in Pink/Black wire. If vehicle is equipped with No. 2 and 3 fuel tanks, go to step  6. If voltage is less than 10 volts, mark mid-ship fuel tank solenoid valve as "STUCK OPEN". Replace solenoid valve after completing all test procedures. If vehicle is equipped with No. 2 and 3 fuel tanks, go to step  6. If vehicle is not equipped with No. 2 and 3 fuel tanks, replace stuck open mid-ship fuel tank solenoid valve. Check system for normal operation.
    3. NOTE: The following step will supply power to fuel tank solenoid valves for 30-60 seconds. If time expires, cycle START/STOP button on NGS scan tool to restore power.

  3. Check Mid-Ship Fuel Tank Solenoid Valve Operation
    Turn ignition switch to OFF position. Connect NGS scan tool to DLC. Reconnect mid-ship fuel tank solenoid valve 2-pin connector. Turn ignition switch to ON position. Using NGS scan tool, access OUTPUT TEST MODE. Press START button on scan tool to command all outputs ON. Observe pressure on fuel filler neck venting kit pressure gauge. Press STOP button on scan tool. If pressure is zero psi (zero kg/cm2 ) when scan tool is triggered ON, go to next step. If pressure is not zero psi (zero kg/cm2 ) when scan tool is triggered ON, mark mid-ship fuel tank solenoid valve as "FUNCTIONS NORMALLY". If vehicle is equipped with No. 2 and 3 fuel tanks, go to step  6. If vehicle is not equipped with No. 2 and 3 fuel tanks, check system for normal operation.
    4. NOTE: The following step will supply power to fuel tank solenoid valves for 30-60 seconds. If time expires, cycle START/STOP button on NGS scan tool to restore power.

  4. Check Mid-Ship Fuel Tank Solenoid Valve Pink/Black Wire For An Open
    Turn ignition switch to OFF position. Disconnect mid-ship fuel tank solenoid valve 2-pin connector. Turn ignition switch to ON position. Using NGS scan tool, access OUTPUT TEST MODE. Press START button on scan tool to command all outputs ON. Measure voltage between chassis ground and Pink/Black wire at mid-ship fuel tank solenoid valve wiring harness connector. Press STOP button on scan tool. If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open in Pink/Black wire. If vehicle is equipped with No. 2 and 3 fuel tanks, go to step  6. If vehicle is not equipped with No. 2 and 3 fuel tanks, check system for normal operation.

  5. Check Mid-Ship Fuel Tank Solenoid Valve Ground Circuit For An Open

    Turn ignition switch to OFF position. Measure resistance between chassis ground and Black wire at mid-ship fuel tank solenoid wiring harness connector. If resistance is less than 5 ohms, mark mid-ship solenoid as "STUCK CLOSED". Replace solenoid after completing all test procedures. If vehicle is equipped with No. 2 and 3 fuel tanks, go to next step. If vehicle is not equipped with No. 2 and 3 fuel tanks, replace solenoid valve for mid-ship fuel tank, then go to next step. If resistance is 5 ohms or more repair open in Black wire between chassis ground and solenoid valve. If vehicle is equipped with No. 2 and 3 fuel tanks, go to next step. If vehicle is not equipped with No. 2 and 3 fuel tanks, check system for normal operation.
    6. NOTE: Ensure manual lockdown valve jackscrew on No. 3 fuel tank solenoid valve is in the OPEN (full counterclockwise) position.

  6. Check No. 3 Fuel Tank Solenoid Valve For An Open
    Reconnect mid-ship fuel tank solenoid valve 2-pin connector. Close mid-ship fuel tank solenoid manual lockdown jack screw and tighten jack screw 62-80 INCH lbs. (7-9 N.m). See Fig 3. Open No. 3 fuel tank solenoid manual lockdown jack screw. Open bleed valve on fuel filler neck venting kit for 60 seconds. Close bleed valve. Observe system pressure on fuel filler neck venting kit pressure gauge. If pressure is zero psi (zero kg/cm2 ), go to step  8. If pressure is not zero psi (zero kg/cm2 ), go to next step.

  7. Check No. 3 Fuel Tank Solenoid Valve Pink/Black Wire For Short To Power

    Disconnect No. 3 fuel tank solenoid valve 2-pin connector. Measure voltage between chassis ground and Pink/Black wire at No. 3 fuel tank wiring harness connector. If voltage is 10 volts or more, repair short to power in Pink/Black wire, then go to step  11. If voltage is less than 10 volts, mark No. 3 fuel tank solenoid valve as "STUCK OPEN" and go to step  11.
    8. NOTE: The following step will supply power to fuel tank solenoid valves for 30-60 seconds. If time expires, cycle START/STOP button on NGS scan tool to restore power.

  8. Check No. 3 Fuel Tank Solenoid Valve Operation
    Reconnect No. 3 fuel tank solenoid valve 2-pin connector. Turn ignition switch to ON position. Using NGS scan tool, access OUTPUT TEST MODE. Press START button on scan tool to command all outputs ON. Observe pressure on fuel filler neck venting kit pressure gauge. Press STOP button on scan tool. If pressure is zero psi (zero kg/cm2 ) when scan tool is triggered ON, go to next step. If pressure is not zero psi (zero kg/cm2 ) when scan tool is triggered ON, mark No. 3 fuel tank solenoid valve as "FUNCTIONS NORMALLY", then go to step  11.
    9. NOTE: The following step will supply power to fuel tank solenoid valves for 30-60 seconds. If time expires, cycle START/STOP button on NGS scan tool to restore power.

  9. Check No. 3 Fuel Tank Solenoid Valve Pink/Black Wire For An Open
    Turn ignition switch to OFF position. Disconnect 2-pin connector for No. 3 fuel tank solenoid valve. Turn ignition switch to ON position. Using NGS scan tool, access OUTPUT TEST MODE. Press START button on scan tool to command all outputs ON. Measure voltage between chassis ground and Pink/Black wire at No. 3 fuel tank solenoid wiring harness connector. Press STOP button on scan tool. If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open in Pink/Black wire, then go to step  11.

  10. Check No. 3 Fuel Tank Solenoid Valve Ground Circuit For An Open

    Turn ignition switch to OFF position. Measure resistance between chassis ground and Black wire at No. 3 fuel tank wiring harness connector. If resistance is more than 5 ohms, repair open in Black wire, then go to next step. If resistance is 5 ohms or less, mark No. 3 fuel tank solenoid valve as "STUCK CLOSED", then go to next step.
    11. NOTE: Ensure manual lockdown valve jackscrew on No. 3 fuel tank solenoid valve is in the OPEN (full counterclockwise) position.

  11. Check No. 2 Fuel Tank Solenoid Valve For An Open
    Reconnect No. 3 fuel tank solenoid valve 2-pin connector. Close No. 3 fuel tank solenoid valve manual lockdown jack screw. See Fig 3. Tighten manual lockdown jack screw 62-80 INCH lbs. (7-9 N.m). Open No. 2 fuel tank solenoid valve manual lockdown jack screw. Open bleed valve on fuel filler neck venting kit for 60 seconds. Close bleed valve. Observe system pressure on fuel filler neck venting kit pressure gauge. If pressure is zero psi (zero kg/cm2 ), go to step  13. If pressure is not zero psi (zero kg/cm2 ), go to next step.

  12. Check No. 2 Fuel Tank Solenoid Valve Pink/Black Wire For Short To Power

    Disconnect No. 2 fuel tank solenoid valve 2-pin connector. Measure voltage between chassis ground and Pink/Black wire at No. 2 fuel tank solenoid valve wiring harness connector. If voltage is 10 volts or more, repair short to power in Pink/Black wire. Replace any solenoid valve that was marked "STUCK CLOSED" or "STUCK OPEN". Check system for normal operation. If voltage is less than 10 volts, mark No. 2 fuel tank solenoid valve as "STUCK OPEN". Replace any solenoid valve that was marked "STUCK CLOSED" or "STUCK OPEN". Check system for normal operation.
    13. NOTE: The following step will supply power to fuel tank solenoid valves for 30-60 seconds. If time expires, cycle START/STOP button on NGS scan tool to restore power.

  13. Check No. 2 Fuel Tank Solenoid Valve Operation
    Reconnect No. 2 fuel tank solenoid valve 2-pin connector. Turn ignition switch to ON position. Using NGS scan tool, access OUTPUT TEST MODE. Press START button on scan tool to command all outputs ON. Observe pressure on fuel filler neck venting kit pressure gauge. Press STOP button on scan tool. If pressure is zero psi (zero kg/cm2 ) when scan tool is triggered ON, go to next step. If pressure is not zero psi (zero kg/cm2 ) when scan tool is triggered ON, mark No. 2 fuel tank solenoid valve as "FUNCTIONS NORMALLY". Replace any solenoid valve that was marked "STUCK CLOSED" or "STUCK OPEN". Check system for normal operation.
    14. NOTE: The following step will supply power to fuel tank solenoid valves for 30-60 seconds. If time expires, cycle START/STOP button on NGS scan tool to restore power.

  14. Check No. 2 Fuel Tank Solenoid Valve Pink/Black Wire For An Open
    Turn ignition switch to OFF position. Disconnect No. 2 fuel tank solenoid valve 2-pin connector. Turn ignition switch to ON position. Using NGS scan tool, access OUTPUT TEST MODE. Press START button on scan tool to command all outputs ON. Measure voltage between chassis ground and Pink/Black wire at No. 2 fuel tank solenoid valve wiring harness connector. Press STOP button on scan tool. If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open in Pink/Black wire. If vehicle is equipped with an extended range fuel tank, go to step  16. If vehicle is not equipped with an extended range fuel tank, replace any solenoid valve that was marked "STUCK CLOSED" or "STUCK OPEN". Check system for normal operation.

  15. Check No. 2 Fuel Tank Solenoid Valve Ground Circuit For An Open

    Turn ignition switch to OFF position. Measure resistance between chassis ground and Black wire at for No. 2 fuel tank solenoid valve wiring harness connector. If resistance is 5 ohms or more, repair open in Black wire. If vehicle is equipped with an extended range fuel tank, go to next step. If vehicle is not equipped with an extended range fuel tank, replace any solenoid valve that was marked "STUCK CLOSED" or "STUCK OPEN". Check system for normal operation. If resistance is less than 5 ohms, mark No. 2 fuel tank solenoid as "STUCK CLOSED". If vehicle is equipped with an extended range fuel tank, go to next step. If vehicle is not equipped with an extended range fuel tank, replace any solenoid valve that was marked "STUCK CLOSED" or "STUCK OPEN". Check system for normal operation.
    16. NOTE: Ensure manual lockdown valve jackscrew on No. 3 fuel tank solenoid valve is in the OPEN (full counterclockwise) position.

  16. Check Extended Range Fuel Tank Solenoid Valve For An Open
    Reconnect No. 2 fuel tank solenoid valve 2-pin connector. Close No. 2 fuel tank solenoid valve manual lockdown jack screw. See Fig 3. Tighten manual lockdown jack screw 62-80 INCH lbs. (7-9 N.m). Open extended range fuel tank solenoid valve manual lockdown jack screw. Open bleed valve on fuel filler neck venting kit for 60 seconds. Close bleed valve. Observe system pressure on fuel filler neck venting kit pressure gauge. If pressure is zero psi (zero kg/cm2 ), go to step  18 . If pressure is not zero psi (zero kg/cm2 ), go to next step.

  17. Check Extended Range Fuel Tank Solenoid Valve Pink/Black Wire For Short To Power

    Disconnect extended range fuel tank solenoid valve 2-pin connector. Measure voltage between chassis ground and Pink/Black wire at extended range fuel tank solenoid valve wiring harness connector. If voltage is 10 volts or more, repair short to power in Pink/Black wire. Replace any solenoid valve that was marked "STUCK CLOSED" or "STUCK OPEN". Check system for normal operation. If voltage is less than 10 volts, mark extended range fuel tank solenoid valve as "STUCK OPEN". Replace any solenoid valve that was marked "STUCK CLOSED" or "STUCK OPEN". Check system for normal operation.
    18. NOTE: The following step will supply power to fuel tank solenoid valves for 30-60 seconds. If time expires, cycle START/STOP button on NGS scan tool to restore power.

  18. Check Extended Range Fuel Tank Solenoid Valve Operation
    Reconnect extended range fuel tank solenoid valve 2-pin connector. Turn ignition switch to ON position. Using NGS scan tool, access OUTPUT TEST MODE. Press START button on scan tool to command all outputs ON. Observe pressure on fuel filler neck venting kit pressure gauge. Press STOP button on scan tool. If pressure is zero psi (zero kg/cm2 ) when scan tool is triggered ON, go to next step. If pressure is not zero psi (zero kg/cm2 ) when scan tool is triggered ON, mark extended range fuel tank solenoid valve as "FUNCTIONS NORMALLY". Replace any solenoid valve that was marked "STUCK CLOSED" or "STUCK OPEN". Check system for normal operation.
    19. NOTE: The following step will supply power to fuel tank solenoid valves for 30-60 seconds. If time expires, cycle START/STOP button on NGS scan tool to restore power.

  19. Check Extended Range Fuel Tank Solenoid Valve Pink/Black Wire For An Open
    Turn ignition switch to OFF position. Disconnect extended range fuel tank solenoid valve 2-pin connector. Turn ignition switch to ON position. Using NGS scan tool, access OUTPUT TEST MODE. Press START button on scan tool to command all outputs ON. Measure voltage between chassis ground and Pink/Black wire at extended range fuel tank solenoid valve wiring harness connector. Press STOP button on scan tool. If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open in Pink/Black wire. Replace any solenoid valve that was marked "STUCK CLOSED" or "STUCK OPEN". Check system for normal operation.

  20. Check Extended Range Fuel Tank Solenoid Valve Ground Circuit For An Open

    Turn ignition switch to OFF position. Measure resistance between chassis ground and Black wire at for extended range fuel tank solenoid valve wiring harness connector. If resistance is 5 ohms or more, repair open in Black wire. Replace any solenoid valve that was marked "STUCK CLOSED" or "STUCK OPEN". Check system for normal operation. If resistance is less than 5 ohms, mark No. 2 fuel tank solenoid as "STUCK CLOSED". Replace any solenoid valve that was marked "STUCK CLOSED" or "STUCK OPEN". Check system for normal operation.
Fig 1: Connecting Grounding Cable To Backside Of Fuel Fill Valve (Econoline & Pickup)
G99J02862Courtesy of FORD MOTOR CO.
Fig 2: Connecting Fuel Filler Neck Venting Kit-To-Fuel Fill Valve
G99C02868Courtesy of FORD MOTOR CO.
Fig 3: Identifying Fuel Tank Solenoid Components
G98E00343Courtesy of FORD MOTOR CO.
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